Okay, just for the sake of argument, the method I use can also work well with a loud clap or dropping a bunch of keys. This was taught to me by a well respected animal behaviourist and I have used it on countless dogs....like I say, it's just to get their attention. An just my opinion.
If the op wishes to go the Miss Stilwell route.....
http://www.thebark.co...l-out-control-barking
Lisa x